ClickHouse/dbms/include/DB/Interpreters/ClusterProxy/IQueryConstructor.h

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#pragma once
#include <DB/Interpreters/Cluster.h>
#include <DB/Parsers/IAST.h>
#include <DB/Storages/IStorage.h>
#include <DB/Client/ConnectionPool.h>
namespace DB
{
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struct Settings;
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class Context;
class Cluster;
class Throttler;
namespace ClusterProxy
{
/// Base class for the implementation of the details of distributed query
/// execution that are specific to the query type.
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class IQueryConstructor
{
public:
virtual ~IQueryConstructor() {}
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/// Create an input stream for local query execution.
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virtual BlockInputStreamPtr createLocal(ASTPtr query_ast, const Context & context, const Cluster::Address & address) = 0;
/// Create an input stream for remote query execution on one shard.
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virtual BlockInputStreamPtr createRemote(IConnectionPool * pool, const std::string & query,
const Settings & settings, ThrottlerPtr throttler, const Context & context) = 0;
/// Create an input stream for remote query execution on one or more shards.
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virtual BlockInputStreamPtr createRemote(ConnectionPoolsPtr & pools, const std::string & query,
const Settings & new_settings, ThrottlerPtr throttler, const Context & context) = 0;
/// Specify how we allocate connections on a shard.
virtual PoolMode getPoolMode() const = 0;
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};
}
}